| Type: | Package |
| Title: | Solar Position Algorithm for Solar Radiation Applications |
| Version: | 1.0 |
| Date: | 2016-01-07 |
| Author: | Jasper Van doninck |
| Maintainer: | Jasper Van doninck <vandoninck.jasper@gmail.com> |
| Description: | Calculation of solar zenith and azimuth angles. |
| License: | GPL-2 |
| NeedsCompilation: | no |
| Packaged: | 2016-01-07 09:17:29 UTC; javado |
| Repository: | CRAN |
| Date/Publication: | 2016-01-07 10:24:13 |
Solar Position Algorithm for Solar Radiation Applications
Description
Implementation of the Solar Position Algorithm for Solar Radiation Applications of Reda and Andreas (2004, 2007) for calculation of solar zenith and azimuth angles.
Details
| Package: | solarPos |
| Type: | Package |
| Version: | 1.0 |
| Date: | 2016-01-07 |
| License: | GPL-2 |
Author(s)
Jasper Van doninck
Maintainer: Jasper Van doninck <vandoninck.jasper@gmail.com>
References
Reda, I. and Andreas, A. (2004) Solar position algorithm for solar radiation applications, Solar Energy 76, 577-589.
Reda, I. and Andreas, A. (2007) Corrigendum to Solar position algorithm for solar radiation applications [Solar Energy 76 (2004) 577589], Solar Energy 81, 838.
Julian Day
Description
Computes Julian Day from year, month, day and time of day.
Usage
julianDay(year, month, day, hour = 12, min = 0, sec = 0, tz = 0, dut1 = 0)
Arguments
year |
Year |
month |
Month (1-12) |
day |
Day (1-12) |
hour |
Hour (0-23) |
min |
Minute (0-59) |
sec |
Second (0-59) |
tz |
Time zone (negative to the west) |
dut1 |
Correction term (0-1) |
Details
Astronomical year numbering is used, i.e., 0 is used for 1 BC, -1 for 2 BC, and so on.
Time is expressed as Coordinated Universal Time (UTC), or Local Standard Time (LST) if the tz argument is used. The argument dut1 is expressed as a fraction of a second and used to correct UTC to Universal Time (UT)
Value
Julian Day
Author(s)
Jasper Van doninck
Examples
julianDay(2000,1,1,12,0,0)
julianDay(2010,5,10,16,30,0,tz=-7)
julianDay(2015,1:12,1,0,0,0)
Solar zenith and azumith angles
Description
Computes the solar zenith and azimuth for a place on Earth for a given date and time.
Usage
solarPosition(jd, lon, lat, delta_t = 32.184, elev = 0, temp = 16, pres = 1013.25)
Arguments
jd |
Julian day, with decimal fraction. |
lon |
Longitude, in decimal degrees. |
lat |
Latitude, in decimal degrees. |
delta_t |
Difference between the Earth rotation time and the Terestrial Time (TT), in seconds. |
elev |
Elevation, in meters. |
temp |
Temperature, in degrees Celsius. |
pres |
Pressure, in hPa. |
Details
Solar zenith and azimuth angle are give in degrees, azimuth is measured eastward from north.
Value
Matrix of solar zenith and azimuth angles.
Author(s)
Jasper Van doninck
Examples
##Julian day
jd <- julianDay(2003,10,17,12,30,30,tz=-7)
##Solar angles
solarPosition(jd,-105.1786,39.742476,delta_t=67,elev=1830.14,temp=11,pres=820)